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Originally Posted by INSIDIOUS '86
Get all your timing at 2500 rpm and if your running a single pipe run a Better flow muffler as well. Your first gear is low and will feel strong with a 700r4. Also please boost valve and sonnax servo your trans.
If your doing a lot of off road better axles and gear are a good idea. If not the ten bolts are almost as strong as car 12 bolts.
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The 3" tail and Flowmaster were already on the truck when I bought it. I'm not a huge fan of the Flowmaster sound anyway, so I was looking at going to a Magnaflow before too long. I plan on doing a decent amount of off-roading, and would like to go larger on the tires. I have heard that anything larger than a 33" and the 10 bolts will start to break stuff if wheeled with any skinny pedal. I didn't personally build the 700r4, I gave it to my tranny guy and said build it so it won't break lol. I'm sure he took care of anything that needed to be done. He built my buddies 4l80e which is behind a twin turbo LS3 in a Silverado so he knows what he is doing.
Quote:
Originally Posted by mopar346
Gears definitely play a huge role in feel, but what has me a little puzzled is you say it is fine on take-off, if anything a 3.08 would be lazy from a stop and run out the big end hard. The exception is if it is combining with the convertor to hold your RPMs down.
I initial reaction from the first post is that I have always heard TBI heads are junk and really cant make them work. I have never tired or never seen any flow numbers on them so I cant say personally, but people I trust a great deal in this area have repeated it over and over. That don't make it true but it is something to consider.
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If I just mash on it off idle it will chirp the tires (it has the gov-lock in the rear) and carry pretty strong through first. The TBI heads are no good for making a high horsepower drag mill. That you are correct on. But they are decent for a towing/offroad motor. They can be had for basically dirt, and they are swirl port, with plugs closer to the center than conventional sbc heads. They produce good torque, and better mileage than equivalent iron heads. I would like to upgrade to some better aluminum heads at some point, but for now, these should be fine.